John Knodel is Professor Emeritus of Sociology and affiliated with the Population Studies Center. H has conducted research in the areas of social demography in developing countries (specializing in Southeast Asia) and European historical demography. His current research focuses on Cambodia, Thailand, and Vietnam and involves studies of the status of and support systems for the elderly, the impact of the AIDS epidemic on older persons, and family change. His most recent book is co-written with Napaporn Chayovan, and titled Population Ageing and the Well-Being of Older Persons in Thailand: Past trends, current situation and future challenges (2009).